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you will need to program / code up the replacement ECU with the immobilizer information for the car

and to do this you will need the pin code for the old and new ECU's

sorry to say that 90% of the time this information is only available to the dealer network and jealously guarded

this blog post details the process:

http://wiki.ross-tech.com/wiki/index.php/Immobilizer_III_ECU_Swapping

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.